Multi-outcome and Multidimensional Market Scoring Rules

Details Multi-outcome and Multidimensional Market Scoring Rules Multi-outcome and Multidimensional Market Scoring Rules

2012-02-08

arxiv.org/abs/1202.1712v1

Computer Science

Computer Science and Game Theory

Scientific paper

Hanson's market scoring rules allow us to design a prediction market that still gives useful information even if we have an illiquid market with a limited number of budget-constrained agents. Each agent can "move" the current price of a market towards their prediction. While this movement still occurs in multi-outcome or multidimensional markets we show that no market-scoring rule, under reasonable conditions, always moves the price directly towards beliefs of the agents. We present a modified version of a market scoring rule for budget-limited traders, and show that it does have the property that, from any starting position, optimal trade by a budget-limited trader will result in the market being moved towards the trader's true belief. This mechanism also retains several attractive strategic properties of the market scoring rule.

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